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RLC-PRC020-EN10
Series Chiller Arrangements
Another energy-saving strategy is to
design the system around chillers
arranged in series, on the evaporator,
condenser, or both. The actual savings
possible with such strategies depends
on the application dynamics and should
be researched by consulting your Trane
Systems Solutions Representative and
applying the Trane System Analyzer
program. It is possible to operate a pair
of chillers more efficiently in a series
chiller arrangement than in a parallel
arrangement. It is also possible to
achieve higher entering-to-leaving chiller
differentials, which may, in turn, provide
the opportunity for lower chilled water
design temperature, lower design flow,
and resulting installation and operational
cost savings. The Trane screw
compressor also has excellent
capabilities for “lift,” which affords an
opportunity for savings on the
evaporator and condenser water loops.
Application
Considerations
Like series arrangements on the
evaporator, series arrangements on the
condenser may enable savings. This
approach may allow reductions in pump
and tower installation and operating
costs. Maximizing system efficiency
requires that the designer balance
performance considerations for all
system components; the best approach
may or may not involve multiple chillers,
or series arrangement of the evaporators
and/or condensers.
This ideal balance of
design integrity with installation and
operating cost considerations can also
be obtained by consulting a Trane
representative and applying the Trane
System Analyzer program.
Water Treatment
The use of untreated or improperly
treated water in chillers may result in
scaling, erosion, corrosion, and algae or
slime buildup. It is recommended that
the services of a qualified water
treatment specialist be engaged to
determine what treatment, if any, is
advisable. Trane assumes no
responsibility for the results of using
untreated or improperly treated water.
Water Pumps
Where noise limitation and vibration-free
operation are important, Trane strongly
encourages the use of 1750-rpm (60 Hz),
1450-rpm (50 Hz) pumps. Specifying or
using 3600-rpm (60 Hz), 3000-rpm (50 Hz)
condenser water and chilled water
pumps must be avoided, because such
pumps may operate with objectionable
levels of noise and vibration. In addition,
a low frequency beat may occur due to
the slight difference in operating rpm
between 3600-rpm (60 Hz), 3000-rpm
(50 Hz) water pumps and Series R chiller
motors.
Important Note: The chilled
water pump must not be used to stop
the chiller.
Acoustic Considerations
For chiller sound ratings, installation tips,
and considerations on chiller location,
pipe isolation, etc., refer to
the Trane
Water-Cooled Series R Chillers Sound
Ratings and Installation Guide
. Using the
information provided in this bulletin,
contact a certified sound consultant to
aid in proper mechanical room design
and treatment.